Keep your vacuum system running smoothly with this replacement retainer nut designed specifically for small cartridge filters. Compatible with Shop Vac model 3183000 and various Vacmaster units, this filter retainer cover cap securely holds your cartridge filter in place for optimal performance. The cap ensures a tight seal, maintaining proper suction power and preventing dust from escaping during operation. Easy to install and remove during filter changes, this durable replacement part helps extend the life of your vacuum system. This essential component matches the specifications of the original equipment, making it a reliable choice for maintaining your vacuum's filtration efficiency. Don't let a worn or lost retainer nut compromise your vacuum's performance - this replacement part will help keep your cleaning routine on track.